34 Tex. Admin. Code § 25.75
Members desiring to make deposits for service or compensation credit for eligible military duty under the Uniformed Services Employment and Re-Employment Rights Act (USERRA) should request in writing to be billed for the cost of the credit. Requests should be addressed to Teacher Retirement System of Texas, 1000 Red River Street, Austin, Texas 78701-2698. Included with the request should be a certified or legible unaltered copy or copies of the member's military service record showing the dates and nature of the member's military duty. Also included with the request should be a certification of the date of the member's application for reemployment with a Teacher Retirement System of Texas (TRS) covered employer or other proof of the date of employment with a TRS covered employer. The system may also require the member to make available to it such other evidence as may be required to establish the member's eligibility under the USERRA and § 25.71 of this title (relating to Service Credit for Eligible Active Military Duty under the Uniformed Services Employment and Re-Employment Rights Act) for service credit and the amount of the deposits due. When the system determines the duty is eligible for credit, it shall bill the member for the total amounts of deposits and fees due for the credit at the last address of the member of which the system has record. The member must return the bill to the system with the total amount due for the eligible credit or with an installment payment agreement and all subsequent installment payments due. Deposits for military duty eligible for credit under the USERRA and § 25.71 of this title must be made no later than five years after the date of re-employment or application for re-employment, subject to any additional period available under USERRA.
34 Tex. Admin. Code § 25.75